Merge tag 'net-next-6.3' of git://git.kernel.org/pub/scm/linux/kernel/git/netdev/net-nextgrafted

Pull networking updates from Jakub Kicinski:
 "Core:

   - Add dedicated kmem_cache for typical/small skb->head, avoid having
     to access struct page at kfree time, and improve memory use.

   - Introduce sysctl to set default RPS configuration for new netdevs.

   - Define Netlink protocol specification format which can be used to
     describe messages used by each family and auto-generate parsers.
     Add tools for generating kernel data structures and uAPI headers.

   - Expose all net/core sysctls inside netns.

   - Remove 4s sleep in netpoll if carrier is instantly detected on
     boot.

   - Add configurable limit of MDB entries per port, and port-vlan.

   - Continue populating drop reasons throughout the stack.

   - Retire a handful of legacy Qdiscs and classifiers.

  Protocols:

   - Support IPv4 big TCP (TSO frames larger than 64kB).

   - Add IP_LOCAL_PORT_RANGE socket option, to control local port range
     on socket by socket basis.

   - Track and report in procfs number of MPTCP sockets used.

   - Support mixing IPv4 and IPv6 flows in the in-kernel MPTCP path
     manager.

   - IPv6: don't check net.ipv6.route.max_size and rely on garbage
     collection to free memory (similarly to IPv4).

   - Support Penultimate Segment Pop (PSP) flavor in SRv6 (RFC8986).

   - ICMP: add per-rate limit counters.

   - Add support for user scanning requests in ieee802154.

   - Remove static WEP support.

   - Support minimal Wi-Fi 7 Extremely High Throughput (EHT) rate
     reporting.

   - WiFi 7 EHT channel puncturing support (client & AP).

  BPF:

   - Add a rbtree data structure following the "next-gen data structure"
     precedent set by recently added linked list, that is, by using
     kfunc + kptr instead of adding a new BPF map type.

   - Expose XDP hints via kfuncs with initial support for RX hash and
     timestamp metadata.

   - Add BPF_F_NO_TUNNEL_KEY extension to bpf_skb_set_tunnel_key to
     better support decap on GRE tunnel devices not operating in collect
     metadata.

   - Improve x86 JIT's codegen for PROBE_MEM runtime error checks.

   - Remove the need for trace_printk_lock for bpf_trace_printk and
     bpf_trace_vprintk helpers.

   - Extend libbpf's bpf_tracing.h support for tracing arguments of
     kprobes/uprobes and syscall as a special case.

   - Significantly reduce the search time for module symbols by
     livepatch and BPF.

   - Enable cpumasks to be used as kptrs, which is useful for tracing
     programs tracking which tasks end up running on which CPUs in
     different time intervals.

   - Add support for BPF trampoline on s390x and riscv64.

   - Add capability to export the XDP features supported by the NIC.

   - Add __bpf_kfunc tag for marking kernel functions as kfuncs.

   - Add cgroup.memory=nobpf kernel parameter option to disable BPF
     memory accounting for container environments.

  Netfilter:

   - Remove the CLUSTERIP target. It has been marked as obsolete for
     years, and we still have WARN splats wrt races of the out-of-band
     /proc interface installed by this target.

   - Add 'destroy' commands to nf_tables. They are identical to the
     existing 'delete' commands, but do not return an error if the
     referenced object (set, chain, rule...) did not exist.

  Driver API:

   - Improve cpumask_local_spread() locality to help NICs set the right
     IRQ affinity on AMD platforms.

   - Separate C22 and C45 MDIO bus transactions more clearly.

   - Introduce new DCB table to control DSCP rewrite on egress.

   - Support configuration of Physical Layer Collision Avoidance (PLCA)
     Reconciliation Sublayer (RS) (802.3cg-2019). Modern version of
     shared medium Ethernet.

   - Support for MAC Merge layer (IEEE 802.3-2018 clause 99). Allowing
     preemption of low priority frames by high priority frames.

   - Add support for controlling MACSec offload using netlink SET.

   - Rework devlink instance refcounts to allow registration and
     de-registration under the instance lock. Split the code into
     multiple files, drop some of the unnecessarily granular locks and
     factor out common parts of netlink operation handling.

   - Add TX frame aggregation parameters (for USB drivers).

   - Add a new attr TCA_EXT_WARN_MSG to report TC (offload) warning
     messages with notifications for debug.

   - Allow offloading of UDP NEW connections via act_ct.

   - Add support for per action HW stats in TC.

   - Support hardware miss to TC action (continue processing in SW from
     a specific point in the action chain).

   - Warn if old Wireless Extension user space interface is used with
     modern cfg80211/mac80211 drivers. Do not support Wireless
     Extensions for Wi-Fi 7 devices at all. Everyone should switch to
     using nl80211 interface instead.

   - Improve the CAN bit timing configuration. Use extack to return
     error messages directly to user space, update the SJW handling,
     including the definition of a new default value that will benefit
     CAN-FD controllers, by increasing their oscillator tolerance.

  New hardware / drivers:

   - Ethernet:
      - nVidia BlueField-3 support (control traffic driver)
      - Ethernet support for imx93 SoCs
      - Motorcomm yt8531 gigabit Ethernet PHY
      - onsemi NCN26000 10BASE-T1S PHY (with support for PLCA)
      - Microchip LAN8841 PHY (incl. cable diagnostics and PTP)
      - Amlogic gxl MDIO mux

   - WiFi:
      - RealTek RTL8188EU (rtl8xxxu)
      - Qualcomm Wi-Fi 7 devices (ath12k)

   - CAN:
      - Renesas R-Car V4H

  Drivers:

   - Bluetooth:
      - Set Per Platform Antenna Gain (PPAG) for Intel controllers.

   - Ethernet NICs:
      - Intel (1G, igc):
         - support TSN / Qbv / packet scheduling features of i226 model
      - Intel (100G, ice):
         - use GNSS subsystem instead of TTY
         - multi-buffer XDP support
         - extend support for GPIO pins to E823 devices
      - nVidia/Mellanox:
         - update the shared buffer configuration on PFC commands
         - implement PTP adjphase function for HW offset control
         - TC support for Geneve and GRE with VF tunnel offload
         - more efficient crypto key management method
         - multi-port eswitch support
      - Netronome/Corigine:
         - add DCB IEEE support
         - support IPsec offloading for NFP3800
      - Freescale/NXP (enetc):
         - support XDP_REDIRECT for XDP non-linear buffers
         - improve reconfig, avoid link flap and waiting for idle
         - support MAC Merge layer
      - Other NICs:
         - sfc/ef100: add basic devlink support for ef100
         - ionic: rx_push mode operation (writing descriptors via MMIO)
         - bnxt: use the auxiliary bus abstraction for RDMA
         - r8169: disable ASPM and reset bus in case of tx timeout
         - cpsw: support QSGMII mode for J721e CPSW9G
         - cpts: support pulse-per-second output
         - ngbe: add an mdio bus driver
         - usbnet: optimize usbnet_bh() by avoiding unnecessary queuing
         - r8152: handle devices with FW with NCM support
         - amd-xgbe: support 10Mbps, 2.5GbE speeds and rx-adaptation
         - virtio-net: support multi buffer XDP
         - virtio/vsock: replace virtio_vsock_pkt with sk_buff
         - tsnep: XDP support

   - Ethernet high-speed switches:
      - nVidia/Mellanox (mlxsw):
         - add support for latency TLV (in FW control messages)
      - Microchip (sparx5):
         - separate explicit and implicit traffic forwarding rules, make
           the implicit rules always active
         - add support for egress DSCP rewrite
         - IS0 VCAP support (Ingress Classification)
         - IS2 VCAP filters (protos, L3 addrs, L4 ports, flags, ToS
           etc.)
         - ES2 VCAP support (Egress Access Control)
         - support for Per-Stream Filtering and Policing (802.1Q,
           8.6.5.1)

   - Ethernet embedded switches:
      - Marvell (mv88e6xxx):
         - add MAB (port auth) offload support
         - enable PTP receive for mv88e6390
      - NXP (ocelot):
         - support MAC Merge layer
         - support for the the vsc7512 internal copper phys
      - Microchip:
         - lan9303: convert to PHYLINK
         - lan966x: support TC flower filter statistics
         - lan937x: PTP support for KSZ9563/KSZ8563 and LAN937x
         - lan937x: support Credit Based Shaper configuration
         - ksz9477: support Energy Efficient Ethernet
      - other:
         - qca8k: convert to regmap read/write API, use bulk operations
         - rswitch: Improve TX timestamp accuracy

   - Intel WiFi (iwlwifi):
      - EHT (Wi-Fi 7) rate reporting
      - STEP equalizer support: transfer some STEP (connection to radio
        on platforms with integrated wifi) related parameters from the
        BIOS to the firmware.

   - Qualcomm 802.11ax WiFi (ath11k):
      - IPQ5018 support
      - Fine Timing Measurement (FTM) responder role support
      - channel 177 support

   - MediaTek WiFi (mt76):
      - per-PHY LED support
      - mt7996: EHT (Wi-Fi 7) support
      - Wireless Ethernet Dispatch (WED) reset support
      - switch to using page pool allocator

   - RealTek WiFi (rtw89):
      - support new version of Bluetooth co-existance

   - Mobile:
      - rmnet: support TX aggregation"

* tag 'net-next-6.3' of git://git.kernel.org/pub/scm/linux/kernel/git/netdev/net-next: (1872 commits)
  page_pool: add a comment explaining the fragment counter usage
  net: ethtool: fix __ethtool_dev_mm_supported() implementation
  ethtool: pse-pd: Fix double word in comments
  xsk: add linux/vmalloc.h to xsk.c
  sefltests: netdevsim: wait for devlink instance after netns removal
  selftest: fib_tests: Always cleanup before exit
  net/mlx5e: Align IPsec ASO result memory to be as required by hardware
  net/mlx5e: TC, Set CT miss to the specific ct action instance
  net/mlx5e: Rename CHAIN_TO_REG to MAPPED_OBJ_TO_REG
  net/mlx5: Refactor tc miss handling to a single function
  net/mlx5: Kconfig: Make tc offload depend on tc skb extension
  net/sched: flower: Support hardware miss to tc action
  net/sched: flower: Move filter handle initialization earlier
  net/sched: cls_api: Support hardware miss to tc action
  net/sched: Rename user cookie and act cookie
  sfc: fix builds without CONFIG_RTC_LIB
  sfc: clean up some inconsistent indentings
  net/mlx4_en: Introduce flexible array to silence overflow warning
  net: lan966x: Fix possible deadlock inside PTP
  net/ulp: Remove redundant ->clone() test in inet_clone_ulp().
  ...

1 files changed, 1360 insertions, 0 deletions

diff --git a/drivers/base/property.c b/drivers/base/property.c
new file mode 100644
index 000000000..083a95791
--- /dev/null
+++ b/drivers/base/property.c
@@ -0,0 +1,1360 @@
+// SPDX-License-Identifier: GPL-2.0
+/*
+ * property.c - Unified device property interface.
+ *
+ * Copyright (C) 2014, Intel Corporation
+ * Authors: Rafael J. Wysocki <rafael.j.wysocki@intel.com>
+ *          Mika Westerberg <mika.westerberg@linux.intel.com>
+ */
+
+#include <linux/acpi.h>
+#include <linux/export.h>
+#include <linux/kernel.h>
+#include <linux/of.h>
+#include <linux/of_address.h>
+#include <linux/of_graph.h>
+#include <linux/of_irq.h>
+#include <linux/property.h>
+#include <linux/phy.h>
+
+struct fwnode_handle *__dev_fwnode(struct device *dev)
+{
+	return IS_ENABLED(CONFIG_OF) && dev->of_node ?
+		of_fwnode_handle(dev->of_node) : dev->fwnode;
+}
+EXPORT_SYMBOL_GPL(__dev_fwnode);
+
+const struct fwnode_handle *__dev_fwnode_const(const struct device *dev)
+{
+	return IS_ENABLED(CONFIG_OF) && dev->of_node ?
+		of_fwnode_handle(dev->of_node) : dev->fwnode;
+}
+EXPORT_SYMBOL_GPL(__dev_fwnode_const);
+
+/**
+ * device_property_present - check if a property of a device is present
+ * @dev: Device whose property is being checked
+ * @propname: Name of the property
+ *
+ * Check if property @propname is present in the device firmware description.
+ */
+bool device_property_present(struct device *dev, const char *propname)
+{
+	return fwnode_property_present(dev_fwnode(dev), propname);
+}
+EXPORT_SYMBOL_GPL(device_property_present);
+
+/**
+ * fwnode_property_present - check if a property of a firmware node is present
+ * @fwnode: Firmware node whose property to check
+ * @propname: Name of the property
+ */
+bool fwnode_property_present(const struct fwnode_handle *fwnode,
+			     const char *propname)
+{
+	bool ret;
+
+	if (IS_ERR_OR_NULL(fwnode))
+		return false;
+
+	ret = fwnode_call_bool_op(fwnode, property_present, propname);
+	if (ret)
+		return ret;
+
+	return fwnode_call_bool_op(fwnode->secondary, property_present, propname);
+}
+EXPORT_SYMBOL_GPL(fwnode_property_present);
+
+/**
+ * device_property_read_u8_array - return a u8 array property of a device
+ * @dev: Device to get the property of
+ * @propname: Name of the property
+ * @val: The values are stored here or %NULL to return the number of values
+ * @nval: Size of the @val array
+ *
+ * Function reads an array of u8 properties with @propname from the device
+ * firmware description and stores them to @val if found.
+ *
+ * It's recommended to call device_property_count_u8() instead of calling
+ * this function with @val equals %NULL and @nval equals 0.
+ *
+ * Return: number of values if @val was %NULL,
+ *         %0 if the property was found (success),
+ *	   %-EINVAL if given arguments are not valid,
+ *	   %-ENODATA if the property does not have a value,
+ *	   %-EPROTO if the property is not an array of numbers,
+ *	   %-EOVERFLOW if the size of the property is not as expected.
+ *	   %-ENXIO if no suitable firmware interface is present.
+ */
+int device_property_read_u8_array(struct device *dev, const char *propname,
+				  u8 *val, size_t nval)
+{
+	return fwnode_property_read_u8_array(dev_fwnode(dev), propname, val, nval);
+}
+EXPORT_SYMBOL_GPL(device_property_read_u8_array);
+
+/**
+ * device_property_read_u16_array - return a u16 array property of a device
+ * @dev: Device to get the property of
+ * @propname: Name of the property
+ * @val: The values are stored here or %NULL to return the number of values
+ * @nval: Size of the @val array
+ *
+ * Function reads an array of u16 properties with @propname from the device
+ * firmware description and stores them to @val if found.
+ *
+ * It's recommended to call device_property_count_u16() instead of calling
+ * this function with @val equals %NULL and @nval equals 0.
+ *
+ * Return: number of values if @val was %NULL,
+ *         %0 if the property was found (success),
+ *	   %-EINVAL if given arguments are not valid,
+ *	   %-ENODATA if the property does not have a value,
+ *	   %-EPROTO if the property is not an array of numbers,
+ *	   %-EOVERFLOW if the size of the property is not as expected.
+ *	   %-ENXIO if no suitable firmware interface is present.
+ */
+int device_property_read_u16_array(struct device *dev, const char *propname,
+				   u16 *val, size_t nval)
+{
+	return fwnode_property_read_u16_array(dev_fwnode(dev), propname, val, nval);
+}
+EXPORT_SYMBOL_GPL(device_property_read_u16_array);
+
+/**
+ * device_property_read_u32_array - return a u32 array property of a device
+ * @dev: Device to get the property of
+ * @propname: Name of the property
+ * @val: The values are stored here or %NULL to return the number of values
+ * @nval: Size of the @val array
+ *
+ * Function reads an array of u32 properties with @propname from the device
+ * firmware description and stores them to @val if found.
+ *
+ * It's recommended to call device_property_count_u32() instead of calling
+ * this function with @val equals %NULL and @nval equals 0.
+ *
+ * Return: number of values if @val was %NULL,
+ *         %0 if the property was found (success),
+ *	   %-EINVAL if given arguments are not valid,
+ *	   %-ENODATA if the property does not have a value,
+ *	   %-EPROTO if the property is not an array of numbers,
+ *	   %-EOVERFLOW if the size of the property is not as expected.
+ *	   %-ENXIO if no suitable firmware interface is present.
+ */
+int device_property_read_u32_array(struct device *dev, const char *propname,
+				   u32 *val, size_t nval)
+{
+	return fwnode_property_read_u32_array(dev_fwnode(dev), propname, val, nval);
+}
+EXPORT_SYMBOL_GPL(device_property_read_u32_array);
+
+/**
+ * device_property_read_u64_array - return a u64 array property of a device
+ * @dev: Device to get the property of
+ * @propname: Name of the property
+ * @val: The values are stored here or %NULL to return the number of values
+ * @nval: Size of the @val array
+ *
+ * Function reads an array of u64 properties with @propname from the device
+ * firmware description and stores them to @val if found.
+ *
+ * It's recommended to call device_property_count_u64() instead of calling
+ * this function with @val equals %NULL and @nval equals 0.
+ *
+ * Return: number of values if @val was %NULL,
+ *         %0 if the property was found (success),
+ *	   %-EINVAL if given arguments are not valid,
+ *	   %-ENODATA if the property does not have a value,
+ *	   %-EPROTO if the property is not an array of numbers,
+ *	   %-EOVERFLOW if the size of the property is not as expected.
+ *	   %-ENXIO if no suitable firmware interface is present.
+ */
+int device_property_read_u64_array(struct device *dev, const char *propname,
+				   u64 *val, size_t nval)
+{
+	return fwnode_property_read_u64_array(dev_fwnode(dev), propname, val, nval);
+}
+EXPORT_SYMBOL_GPL(device_property_read_u64_array);
+
+/**
+ * device_property_read_string_array - return a string array property of device
+ * @dev: Device to get the property of
+ * @propname: Name of the property
+ * @val: The values are stored here or %NULL to return the number of values
+ * @nval: Size of the @val array
+ *
+ * Function reads an array of string properties with @propname from the device
+ * firmware description and stores them to @val if found.
+ *
+ * It's recommended to call device_property_string_array_count() instead of calling
+ * this function with @val equals %NULL and @nval equals 0.
+ *
+ * Return: number of values read on success if @val is non-NULL,
+ *	   number of values available on success if @val is NULL,
+ *	   %-EINVAL if given arguments are not valid,
+ *	   %-ENODATA if the property does not have a value,
+ *	   %-EPROTO or %-EILSEQ if the property is not an array of strings,
+ *	   %-EOVERFLOW if the size of the property is not as expected.
+ *	   %-ENXIO if no suitable firmware interface is present.
+ */
+int device_property_read_string_array(struct device *dev, const char *propname,
+				      const char **val, size_t nval)
+{
+	return fwnode_property_read_string_array(dev_fwnode(dev), propname, val, nval);
+}
+EXPORT_SYMBOL_GPL(device_property_read_string_array);
+
+/**
+ * device_property_read_string - return a string property of a device
+ * @dev: Device to get the property of
+ * @propname: Name of the property
+ * @val: The value is stored here
+ *
+ * Function reads property @propname from the device firmware description and
+ * stores the value into @val if found. The value is checked to be a string.
+ *
+ * Return: %0 if the property was found (success),
+ *	   %-EINVAL if given arguments are not valid,
+ *	   %-ENODATA if the property does not have a value,
+ *	   %-EPROTO or %-EILSEQ if the property type is not a string.
+ *	   %-ENXIO if no suitable firmware interface is present.
+ */
+int device_property_read_string(struct device *dev, const char *propname,
+				const char **val)
+{
+	return fwnode_property_read_string(dev_fwnode(dev), propname, val);
+}
+EXPORT_SYMBOL_GPL(device_property_read_string);
+
+/**
+ * device_property_match_string - find a string in an array and return index
+ * @dev: Device to get the property of
+ * @propname: Name of the property holding the array
+ * @string: String to look for
+ *
+ * Find a given string in a string array and if it is found return the
+ * index back.
+ *
+ * Return: index, starting from %0, if the property was found (success),
+ *	   %-EINVAL if given arguments are not valid,
+ *	   %-ENODATA if the property does not have a value,
+ *	   %-EPROTO if the property is not an array of strings,
+ *	   %-ENXIO if no suitable firmware interface is present.
+ */
+int device_property_match_string(struct device *dev, const char *propname,
+				 const char *string)
+{
+	return fwnode_property_match_string(dev_fwnode(dev), propname, string);
+}
+EXPORT_SYMBOL_GPL(device_property_match_string);
+
+static int fwnode_property_read_int_array(const struct fwnode_handle *fwnode,
+					  const char *propname,
+					  unsigned int elem_size, void *val,
+					  size_t nval)
+{
+	int ret;
+
+	if (IS_ERR_OR_NULL(fwnode))
+		return -EINVAL;
+
+	ret = fwnode_call_int_op(fwnode, property_read_int_array, propname,
+				 elem_size, val, nval);
+	if (ret != -EINVAL)
+		return ret;
+
+	return fwnode_call_int_op(fwnode->secondary, property_read_int_array, propname,
+				  elem_size, val, nval);
+}
+
+/**
+ * fwnode_property_read_u8_array - return a u8 array property of firmware node
+ * @fwnode: Firmware node to get the property of
+ * @propname: Name of the property
+ * @val: The values are stored here or %NULL to return the number of values
+ * @nval: Size of the @val array
+ *
+ * Read an array of u8 properties with @propname from @fwnode and stores them to
+ * @val if found.
+ *
+ * It's recommended to call fwnode_property_count_u8() instead of calling
+ * this function with @val equals %NULL and @nval equals 0.
+ *
+ * Return: number of values if @val was %NULL,
+ *         %0 if the property was found (success),
+ *	   %-EINVAL if given arguments are not valid,
+ *	   %-ENODATA if the property does not have a value,
+ *	   %-EPROTO if the property is not an array of numbers,
+ *	   %-EOVERFLOW if the size of the property is not as expected,
+ *	   %-ENXIO if no suitable firmware interface is present.
+ */
+int fwnode_property_read_u8_array(const struct fwnode_handle *fwnode,
+				  const char *propname, u8 *val, size_t nval)
+{
+	return fwnode_property_read_int_array(fwnode, propname, sizeof(u8),
+					      val, nval);
+}
+EXPORT_SYMBOL_GPL(fwnode_property_read_u8_array);
+
+/**
+ * fwnode_property_read_u16_array - return a u16 array property of firmware node
+ * @fwnode: Firmware node to get the property of
+ * @propname: Name of the property
+ * @val: The values are stored here or %NULL to return the number of values
+ * @nval: Size of the @val array
+ *
+ * Read an array of u16 properties with @propname from @fwnode and store them to
+ * @val if found.
+ *
+ * It's recommended to call fwnode_property_count_u16() instead of calling
+ * this function with @val equals %NULL and @nval equals 0.
+ *
+ * Return: number of values if @val was %NULL,
+ *         %0 if the property was found (success),
+ *	   %-EINVAL if given arguments are not valid,
+ *	   %-ENODATA if the property does not have a value,
+ *	   %-EPROTO if the property is not an array of numbers,
+ *	   %-EOVERFLOW if the size of the property is not as expected,
+ *	   %-ENXIO if no suitable firmware interface is present.
+ */
+int fwnode_property_read_u16_array(const struct fwnode_handle *fwnode,
+				   const char *propname, u16 *val, size_t nval)
+{
+	return fwnode_property_read_int_array(fwnode, propname, sizeof(u16),
+					      val, nval);
+}
+EXPORT_SYMBOL_GPL(fwnode_property_read_u16_array);
+
+/**
+ * fwnode_property_read_u32_array - return a u32 array property of firmware node
+ * @fwnode: Firmware node to get the property of
+ * @propname: Name of the property
+ * @val: The values are stored here or %NULL to return the number of values
+ * @nval: Size of the @val array
+ *
+ * Read an array of u32 properties with @propname from @fwnode store them to
+ * @val if found.
+ *
+ * It's recommended to call fwnode_property_count_u32() instead of calling
+ * this function with @val equals %NULL and @nval equals 0.
+ *
+ * Return: number of values if @val was %NULL,
+ *         %0 if the property was found (success),
+ *	   %-EINVAL if given arguments are not valid,
+ *	   %-ENODATA if the property does not have a value,
+ *	   %-EPROTO if the property is not an array of numbers,
+ *	   %-EOVERFLOW if the size of the property is not as expected,
+ *	   %-ENXIO if no suitable firmware interface is present.
+ */
+int fwnode_property_read_u32_array(const struct fwnode_handle *fwnode,
+				   const char *propname, u32 *val, size_t nval)
+{
+	return fwnode_property_read_int_array(fwnode, propname, sizeof(u32),
+					      val, nval);
+}
+EXPORT_SYMBOL_GPL(fwnode_property_read_u32_array);
+
+/**
+ * fwnode_property_read_u64_array - return a u64 array property firmware node
+ * @fwnode: Firmware node to get the property of
+ * @propname: Name of the property
+ * @val: The values are stored here or %NULL to return the number of values
+ * @nval: Size of the @val array
+ *
+ * Read an array of u64 properties with @propname from @fwnode and store them to
+ * @val if found.
+ *
+ * It's recommended to call fwnode_property_count_u64() instead of calling
+ * this function with @val equals %NULL and @nval equals 0.
+ *
+ * Return: number of values if @val was %NULL,
+ *         %0 if the property was found (success),
+ *	   %-EINVAL if given arguments are not valid,
+ *	   %-ENODATA if the property does not have a value,
+ *	   %-EPROTO if the property is not an array of numbers,
+ *	   %-EOVERFLOW if the size of the property is not as expected,
+ *	   %-ENXIO if no suitable firmware interface is present.
+ */
+int fwnode_property_read_u64_array(const struct fwnode_handle *fwnode,
+				   const char *propname, u64 *val, size_t nval)
+{
+	return fwnode_property_read_int_array(fwnode, propname, sizeof(u64),
+					      val, nval);
+}
+EXPORT_SYMBOL_GPL(fwnode_property_read_u64_array);
+
+/**
+ * fwnode_property_read_string_array - return string array property of a node
+ * @fwnode: Firmware node to get the property of
+ * @propname: Name of the property
+ * @val: The values are stored here or %NULL to return the number of values
+ * @nval: Size of the @val array
+ *
+ * Read an string list property @propname from the given firmware node and store
+ * them to @val if found.
+ *
+ * It's recommended to call fwnode_property_string_array_count() instead of calling
+ * this function with @val equals %NULL and @nval equals 0.
+ *
+ * Return: number of values read on success if @val is non-NULL,
+ *	   number of values available on success if @val is NULL,
+ *	   %-EINVAL if given arguments are not valid,
+ *	   %-ENODATA if the property does not have a value,
+ *	   %-EPROTO or %-EILSEQ if the property is not an array of strings,
+ *	   %-EOVERFLOW if the size of the property is not as expected,
+ *	   %-ENXIO if no suitable firmware interface is present.
+ */
+int fwnode_property_read_string_array(const struct fwnode_handle *fwnode,
+				      const char *propname, const char **val,
+				      size_t nval)
+{
+	int ret;
+
+	if (IS_ERR_OR_NULL(fwnode))
+		return -EINVAL;
+
+	ret = fwnode_call_int_op(fwnode, property_read_string_array, propname,
+				 val, nval);
+	if (ret != -EINVAL)
+		return ret;
+
+	return fwnode_call_int_op(fwnode->secondary, property_read_string_array, propname,
+				  val, nval);
+}
+EXPORT_SYMBOL_GPL(fwnode_property_read_string_array);
+
+/**
+ * fwnode_property_read_string - return a string property of a firmware node
+ * @fwnode: Firmware node to get the property of
+ * @propname: Name of the property
+ * @val: The value is stored here
+ *
+ * Read property @propname from the given firmware node and store the value into
+ * @val if found.  The value is checked to be a string.
+ *
+ * Return: %0 if the property was found (success),
+ *	   %-EINVAL if given arguments are not valid,
+ *	   %-ENODATA if the property does not have a value,
+ *	   %-EPROTO or %-EILSEQ if the property is not a string,
+ *	   %-ENXIO if no suitable firmware interface is present.
+ */
+int fwnode_property_read_string(const struct fwnode_handle *fwnode,
+				const char *propname, const char **val)
+{
+	int ret = fwnode_property_read_string_array(fwnode, propname, val, 1);
+
+	return ret < 0 ? ret : 0;
+}
+EXPORT_SYMBOL_GPL(fwnode_property_read_string);
+
+/**
+ * fwnode_property_match_string - find a string in an array and return index
+ * @fwnode: Firmware node to get the property of
+ * @propname: Name of the property holding the array
+ * @string: String to look for
+ *
+ * Find a given string in a string array and if it is found return the
+ * index back.
+ *
+ * Return: index, starting from %0, if the property was found (success),
+ *	   %-EINVAL if given arguments are not valid,
+ *	   %-ENODATA if the property does not have a value,
+ *	   %-EPROTO if the property is not an array of strings,
+ *	   %-ENXIO if no suitable firmware interface is present.
+ */
+int fwnode_property_match_string(const struct fwnode_handle *fwnode,
+	const char *propname, const char *string)
+{
+	const char **values;
+	int nval, ret;
+
+	nval = fwnode_property_read_string_array(fwnode, propname, NULL, 0);
+	if (nval < 0)
+		return nval;
+
+	if (nval == 0)
+		return -ENODATA;
+
+	values = kcalloc(nval, sizeof(*values), GFP_KERNEL);
+	if (!values)
+		return -ENOMEM;
+
+	ret = fwnode_property_read_string_array(fwnode, propname, values, nval);
+	if (ret < 0)
+		goto out_free;
+
+	ret = match_string(values, nval, string);
+	if (ret < 0)
+		ret = -ENODATA;
+
+out_free:
+	kfree(values);
+	return ret;
+}
+EXPORT_SYMBOL_GPL(fwnode_property_match_string);
+
+/**
+ * fwnode_property_get_reference_args() - Find a reference with arguments
+ * @fwnode:	Firmware node where to look for the reference
+ * @prop:	The name of the property
+ * @nargs_prop:	The name of the property telling the number of
+ *		arguments in the referred node. NULL if @nargs is known,
+ *		otherwise @nargs is ignored. Only relevant on OF.
+ * @nargs:	Number of arguments. Ignored if @nargs_prop is non-NULL.
+ * @index:	Index of the reference, from zero onwards.
+ * @args:	Result structure with reference and integer arguments.
+ *
+ * Obtain a reference based on a named property in an fwnode, with
+ * integer arguments.
+ *
+ * Caller is responsible to call fwnode_handle_put() on the returned
+ * args->fwnode pointer.
+ *
+ * Returns: %0 on success
+ *	    %-ENOENT when the index is out of bounds, the index has an empty
+ *		     reference or the property was not found
+ *	    %-EINVAL on parse error
+ */
+int fwnode_property_get_reference_args(const struct fwnode_handle *fwnode,
+				       const char *prop, const char *nargs_prop,
+				       unsigned int nargs, unsigned int index,
+				       struct fwnode_reference_args *args)
+{
+	int ret;
+
+	if (IS_ERR_OR_NULL(fwnode))
+		return -ENOENT;
+
+	ret = fwnode_call_int_op(fwnode, get_reference_args, prop, nargs_prop,
+				 nargs, index, args);
+	if (ret == 0)
+		return ret;
+
+	if (IS_ERR_OR_NULL(fwnode->secondary))
+		return ret;
+
+	return fwnode_call_int_op(fwnode->secondary, get_reference_args, prop, nargs_prop,
+				  nargs, index, args);
+}
+EXPORT_SYMBOL_GPL(fwnode_property_get_reference_args);
+
+/**
+ * fwnode_find_reference - Find named reference to a fwnode_handle
+ * @fwnode: Firmware node where to look for the reference
+ * @name: The name of the reference
+ * @index: Index of the reference
+ *
+ * @index can be used when the named reference holds a table of references.
+ *
+ * Returns pointer to the reference fwnode, or ERR_PTR. Caller is responsible to
+ * call fwnode_handle_put() on the returned fwnode pointer.
+ */
+struct fwnode_handle *fwnode_find_reference(const struct fwnode_handle *fwnode,
+					    const char *name,
+					    unsigned int index)
+{
+	struct fwnode_reference_args args;
+	int ret;
+
+	ret = fwnode_property_get_reference_args(fwnode, name, NULL, 0, index,
+						 &args);
+	return ret ? ERR_PTR(ret) : args.fwnode;
+}
+EXPORT_SYMBOL_GPL(fwnode_find_reference);
+
+/**
+ * fwnode_get_name - Return the name of a node
+ * @fwnode: The firmware node
+ *
+ * Returns a pointer to the node name.
+ */
+const char *fwnode_get_name(const struct fwnode_handle *fwnode)
+{
+	return fwnode_call_ptr_op(fwnode, get_name);
+}
+EXPORT_SYMBOL_GPL(fwnode_get_name);
+
+/**
+ * fwnode_get_name_prefix - Return the prefix of node for printing purposes
+ * @fwnode: The firmware node
+ *
+ * Returns the prefix of a node, intended to be printed right before the node.
+ * The prefix works also as a separator between the nodes.
+ */
+const char *fwnode_get_name_prefix(const struct fwnode_handle *fwnode)
+{
+	return fwnode_call_ptr_op(fwnode, get_name_prefix);
+}
+
+/**
+ * fwnode_get_parent - Return parent firwmare node
+ * @fwnode: Firmware whose parent is retrieved
+ *
+ * Return parent firmware node of the given node if possible or %NULL if no
+ * parent was available.
+ */
+struct fwnode_handle *fwnode_get_parent(const struct fwnode_handle *fwnode)
+{
+	return fwnode_call_ptr_op(fwnode, get_parent);
+}
+EXPORT_SYMBOL_GPL(fwnode_get_parent);
+
+/**
+ * fwnode_get_next_parent - Iterate to the node's parent
+ * @fwnode: Firmware whose parent is retrieved
+ *
+ * This is like fwnode_get_parent() except that it drops the refcount
+ * on the passed node, making it suitable for iterating through a
+ * node's parents.
+ *
+ * Returns a node pointer with refcount incremented, use
+ * fwnode_handle_put() on it when done.
+ */
+struct fwnode_handle *fwnode_get_next_parent(struct fwnode_handle *fwnode)
+{
+	struct fwnode_handle *parent = fwnode_get_parent(fwnode);
+
+	fwnode_handle_put(fwnode);
+
+	return parent;
+}
+EXPORT_SYMBOL_GPL(fwnode_get_next_parent);
+
+/**
+ * fwnode_get_next_parent_dev - Find device of closest ancestor fwnode
+ * @fwnode: firmware node
+ *
+ * Given a firmware node (@fwnode), this function finds its closest ancestor
+ * firmware node that has a corresponding struct device and returns that struct
+ * device.
+ *
+ * The caller of this function is expected to call put_device() on the returned
+ * device when they are done.
+ */
+struct device *fwnode_get_next_parent_dev(struct fwnode_handle *fwnode)
+{
+	struct fwnode_handle *parent;
+	struct device *dev;
+
+	fwnode_for_each_parent_node(fwnode, parent) {
+		dev = get_dev_from_fwnode(parent);
+		if (dev) {
+			fwnode_handle_put(parent);
+			return dev;
+		}
+	}
+	return NULL;
+}
+
+/**
+ * fwnode_count_parents - Return the number of parents a node has
+ * @fwnode: The node the parents of which are to be counted
+ *
+ * Returns the number of parents a node has.
+ */
+unsigned int fwnode_count_parents(const struct fwnode_handle *fwnode)
+{
+	struct fwnode_handle *parent;
+	unsigned int count = 0;
+
+	fwnode_for_each_parent_node(fwnode, parent)
+		count++;
+
+	return count;
+}
+EXPORT_SYMBOL_GPL(fwnode_count_parents);
+
+/**
+ * fwnode_get_nth_parent - Return an nth parent of a node
+ * @fwnode: The node the parent of which is requested
+ * @depth: Distance of the parent from the node
+ *
+ * Returns the nth parent of a node. If there is no parent at the requested
+ * @depth, %NULL is returned. If @depth is 0, the functionality is equivalent to
+ * fwnode_handle_get(). For @depth == 1, it is fwnode_get_parent() and so on.
+ *
+ * The caller is responsible for calling fwnode_handle_put() for the returned
+ * node.
+ */
+struct fwnode_handle *fwnode_get_nth_parent(struct fwnode_handle *fwnode,
+					    unsigned int depth)
+{
+	struct fwnode_handle *parent;
+
+	if (depth == 0)
+		return fwnode_handle_get(fwnode);
+
+	fwnode_for_each_parent_node(fwnode, parent) {
+		if (--depth == 0)
+			return parent;
+	}
+	return NULL;
+}
+EXPORT_SYMBOL_GPL(fwnode_get_nth_parent);
+
+/**
+ * fwnode_is_ancestor_of - Test if @ancestor is ancestor of @child
+ * @ancestor: Firmware which is tested for being an ancestor
+ * @child: Firmware which is tested for being the child
+ *
+ * A node is considered an ancestor of itself too.
+ *
+ * Returns true if @ancestor is an ancestor of @child. Otherwise, returns false.
+ */
+bool fwnode_is_ancestor_of(struct fwnode_handle *ancestor, struct fwnode_handle *child)
+{
+	struct fwnode_handle *parent;
+
+	if (IS_ERR_OR_NULL(ancestor))
+		return false;
+
+	if (child == ancestor)
+		return true;
+
+	fwnode_for_each_parent_node(child, parent) {
+		if (parent == ancestor) {
+			fwnode_handle_put(parent);
+			return true;
+		}
+	}
+	return false;
+}
+
+/**
+ * fwnode_get_next_child_node - Return the next child node handle for a node
+ * @fwnode: Firmware node to find the next child node for.
+ * @child: Handle to one of the node's child nodes or a %NULL handle.
+ */
+struct fwnode_handle *
+fwnode_get_next_child_node(const struct fwnode_handle *fwnode,
+			   struct fwnode_handle *child)
+{
+	return fwnode_call_ptr_op(fwnode, get_next_child_node, child);
+}
+EXPORT_SYMBOL_GPL(fwnode_get_next_child_node);
+
+/**
+ * fwnode_get_next_available_child_node - Return the next
+ * available child node handle for a node
+ * @fwnode: Firmware node to find the next child node for.
+ * @child: Handle to one of the node's child nodes or a %NULL handle.
+ */
+struct fwnode_handle *
+fwnode_get_next_available_child_node(const struct fwnode_handle *fwnode,
+				     struct fwnode_handle *child)
+{
+	struct fwnode_handle *next_child = child;
+
+	if (IS_ERR_OR_NULL(fwnode))
+		return NULL;
+
+	do {
+		next_child = fwnode_get_next_child_node(fwnode, next_child);
+		if (!next_child)
+			return NULL;
+	} while (!fwnode_device_is_available(next_child));
+
+	return next_child;
+}
+EXPORT_SYMBOL_GPL(fwnode_get_next_available_child_node);
+
+/**
+ * device_get_next_child_node - Return the next child node handle for a device
+ * @dev: Device to find the next child node for.
+ * @child: Handle to one of the device's child nodes or a null handle.
+ */
+struct fwnode_handle *device_get_next_child_node(const struct device *dev,
+						 struct fwnode_handle *child)
+{
+	const struct fwnode_handle *fwnode = dev_fwnode(dev);
+	struct fwnode_handle *next;
+
+	if (IS_ERR_OR_NULL(fwnode))
+		return NULL;
+
+	/* Try to find a child in primary fwnode */
+	next = fwnode_get_next_child_node(fwnode, child);
+	if (next)
+		return next;
+
+	/* When no more children in primary, continue with secondary */
+	return fwnode_get_next_child_node(fwnode->secondary, child);
+}
+EXPORT_SYMBOL_GPL(device_get_next_child_node);
+
+/**
+ * fwnode_get_named_child_node - Return first matching named child node handle
+ * @fwnode: Firmware node to find the named child node for.
+ * @childname: String to match child node name against.
+ */
+struct fwnode_handle *
+fwnode_get_named_child_node(const struct fwnode_handle *fwnode,
+			    const char *childname)
+{
+	return fwnode_call_ptr_op(fwnode, get_named_child_node, childname);
+}
+EXPORT_SYMBOL_GPL(fwnode_get_named_child_node);
+
+/**
+ * device_get_named_child_node - Return first matching named child node handle
+ * @dev: Device to find the named child node for.
+ * @childname: String to match child node name against.
+ */
+struct fwnode_handle *device_get_named_child_node(const struct device *dev,
+						  const char *childname)
+{
+	return fwnode_get_named_child_node(dev_fwnode(dev), childname);
+}
+EXPORT_SYMBOL_GPL(device_get_named_child_node);
+
+/**
+ * fwnode_handle_get - Obtain a reference to a device node
+ * @fwnode: Pointer to the device node to obtain the reference to.
+ *
+ * Returns the fwnode handle.
+ */
+struct fwnode_handle *fwnode_handle_get(struct fwnode_handle *fwnode)
+{
+	if (!fwnode_has_op(fwnode, get))
+		return fwnode;
+
+	return fwnode_call_ptr_op(fwnode, get);
+}
+EXPORT_SYMBOL_GPL(fwnode_handle_get);
+
+/**
+ * fwnode_handle_put - Drop reference to a device node
+ * @fwnode: Pointer to the device node to drop the reference to.
+ *
+ * This has to be used when terminating device_for_each_child_node() iteration
+ * with break or return to prevent stale device node references from being left
+ * behind.
+ */
+void fwnode_handle_put(struct fwnode_handle *fwnode)
+{
+	fwnode_call_void_op(fwnode, put);
+}
+EXPORT_SYMBOL_GPL(fwnode_handle_put);
+
+/**
+ * fwnode_device_is_available - check if a device is available for use
+ * @fwnode: Pointer to the fwnode of the device.
+ *
+ * For fwnode node types that don't implement the .device_is_available()
+ * operation, this function returns true.
+ */
+bool fwnode_device_is_available(const struct fwnode_handle *fwnode)
+{
+	if (IS_ERR_OR_NULL(fwnode))
+		return false;
+
+	if (!fwnode_has_op(fwnode, device_is_available))
+		return true;
+
+	return fwnode_call_bool_op(fwnode, device_is_available);
+}
+EXPORT_SYMBOL_GPL(fwnode_device_is_available);
+
+/**
+ * device_get_child_node_count - return the number of child nodes for device
+ * @dev: Device to cound the child nodes for
+ */
+unsigned int device_get_child_node_count(const struct device *dev)
+{
+	struct fwnode_handle *child;
+	unsigned int count = 0;
+
+	device_for_each_child_node(dev, child)
+		count++;
+
+	return count;
+}
+EXPORT_SYMBOL_GPL(device_get_child_node_count);
+
+bool device_dma_supported(const struct device *dev)
+{
+	return fwnode_call_bool_op(dev_fwnode(dev), device_dma_supported);
+}
+EXPORT_SYMBOL_GPL(device_dma_supported);
+
+enum dev_dma_attr device_get_dma_attr(const struct device *dev)
+{
+	if (!fwnode_has_op(dev_fwnode(dev), device_get_dma_attr))
+		return DEV_DMA_NOT_SUPPORTED;
+
+	return fwnode_call_int_op(dev_fwnode(dev), device_get_dma_attr);
+}
+EXPORT_SYMBOL_GPL(device_get_dma_attr);
+
+/**
+ * fwnode_get_phy_mode - Get phy mode for given firmware node
+ * @fwnode:	Pointer to the given node
+ *
+ * The function gets phy interface string from property 'phy-mode' or
+ * 'phy-connection-type', and return its index in phy_modes table, or errno in
+ * error case.
+ */
+int fwnode_get_phy_mode(struct fwnode_handle *fwnode)
+{
+	const char *pm;
+	int err, i;
+
+	err = fwnode_property_read_string(fwnode, "phy-mode", &pm);
+	if (err < 0)
+		err = fwnode_property_read_string(fwnode,
+						  "phy-connection-type", &pm);
+	if (err < 0)
+		return err;
+
+	for (i = 0; i < PHY_INTERFACE_MODE_MAX; i++)
+		if (!strcasecmp(pm, phy_modes(i)))
+			return i;
+
+	return -ENODEV;
+}
+EXPORT_SYMBOL_GPL(fwnode_get_phy_mode);
+
+/**
+ * device_get_phy_mode - Get phy mode for given device
+ * @dev:	Pointer to the given device
+ *
+ * The function gets phy interface string from property 'phy-mode' or
+ * 'phy-connection-type', and return its index in phy_modes table, or errno in
+ * error case.
+ */
+int device_get_phy_mode(struct device *dev)
+{
+	return fwnode_get_phy_mode(dev_fwnode(dev));
+}
+EXPORT_SYMBOL_GPL(device_get_phy_mode);
+
+/**
+ * fwnode_iomap - Maps the memory mapped IO for a given fwnode
+ * @fwnode:	Pointer to the firmware node
+ * @index:	Index of the IO range
+ *
+ * Returns a pointer to the mapped memory.
+ */
+void __iomem *fwnode_iomap(struct fwnode_handle *fwnode, int index)
+{
+	return fwnode_call_ptr_op(fwnode, iomap, index);
+}
+EXPORT_SYMBOL(fwnode_iomap);
+
+/**
+ * fwnode_irq_get - Get IRQ directly from a fwnode
+ * @fwnode:	Pointer to the firmware node
+ * @index:	Zero-based index of the IRQ
+ *
+ * Returns Linux IRQ number on success. Other values are determined
+ * accordingly to acpi_/of_ irq_get() operation.
+ */
+int fwnode_irq_get(const struct fwnode_handle *fwnode, unsigned int index)
+{
+	return fwnode_call_int_op(fwnode, irq_get, index);
+}
+EXPORT_SYMBOL(fwnode_irq_get);
+
+/**
+ * fwnode_irq_get_byname - Get IRQ from a fwnode using its name
+ * @fwnode:	Pointer to the firmware node
+ * @name:	IRQ name
+ *
+ * Description:
+ * Find a match to the string @name in the 'interrupt-names' string array
+ * in _DSD for ACPI, or of_node for Device Tree. Then get the Linux IRQ
+ * number of the IRQ resource corresponding to the index of the matched
+ * string.
+ *
+ * Return:
+ * Linux IRQ number on success, or negative errno otherwise.
+ */
+int fwnode_irq_get_byname(const struct fwnode_handle *fwnode, const char *name)
+{
+	int index;
+
+	if (!name)
+		return -EINVAL;
+
+	index = fwnode_property_match_string(fwnode, "interrupt-names",  name);
+	if (index < 0)
+		return index;
+
+	return fwnode_irq_get(fwnode, index);
+}
+EXPORT_SYMBOL(fwnode_irq_get_byname);
+
+/**
+ * fwnode_graph_get_next_endpoint - Get next endpoint firmware node
+ * @fwnode: Pointer to the parent firmware node
+ * @prev: Previous endpoint node or %NULL to get the first
+ *
+ * Returns an endpoint firmware node pointer or %NULL if no more endpoints
+ * are available.
+ */
+struct fwnode_handle *
+fwnode_graph_get_next_endpoint(const struct fwnode_handle *fwnode,
+			       struct fwnode_handle *prev)
+{
+	struct fwnode_handle *ep, *port_parent = NULL;
+	const struct fwnode_handle *parent;
+
+	/*
+	 * If this function is in a loop and the previous iteration returned
+	 * an endpoint from fwnode->secondary, then we need to use the secondary
+	 * as parent rather than @fwnode.
+	 */
+	if (prev) {
+		port_parent = fwnode_graph_get_port_parent(prev);
+		parent = port_parent;
+	} else {
+		parent = fwnode;
+	}
+	if (IS_ERR_OR_NULL(parent))
+		return NULL;
+
+	ep = fwnode_call_ptr_op(parent, graph_get_next_endpoint, prev);
+	if (ep)
+		goto out_put_port_parent;
+
+	ep = fwnode_graph_get_next_endpoint(parent->secondary, NULL);
+
+out_put_port_parent:
+	fwnode_handle_put(port_parent);
+	return ep;
+}
+EXPORT_SYMBOL_GPL(fwnode_graph_get_next_endpoint);
+
+/**
+ * fwnode_graph_get_port_parent - Return the device fwnode of a port endpoint
+ * @endpoint: Endpoint firmware node of the port
+ *
+ * Return: the firmware node of the device the @endpoint belongs to.
+ */
+struct fwnode_handle *
+fwnode_graph_get_port_parent(const struct fwnode_handle *endpoint)
+{
+	struct fwnode_handle *port, *parent;
+
+	port = fwnode_get_parent(endpoint);
+	parent = fwnode_call_ptr_op(port, graph_get_port_parent);
+
+	fwnode_handle_put(port);
+
+	return parent;
+}
+EXPORT_SYMBOL_GPL(fwnode_graph_get_port_parent);
+
+/**
+ * fwnode_graph_get_remote_port_parent - Return fwnode of a remote device
+ * @fwnode: Endpoint firmware node pointing to the remote endpoint
+ *
+ * Extracts firmware node of a remote device the @fwnode points to.
+ */
+struct fwnode_handle *
+fwnode_graph_get_remote_port_parent(const struct fwnode_handle *fwnode)
+{
+	struct fwnode_handle *endpoint, *parent;
+
+	endpoint = fwnode_graph_get_remote_endpoint(fwnode);
+	parent = fwnode_graph_get_port_parent(endpoint);
+
+	fwnode_handle_put(endpoint);
+
+	return parent;
+}
+EXPORT_SYMBOL_GPL(fwnode_graph_get_remote_port_parent);
+
+/**
+ * fwnode_graph_get_remote_port - Return fwnode of a remote port
+ * @fwnode: Endpoint firmware node pointing to the remote endpoint
+ *
+ * Extracts firmware node of a remote port the @fwnode points to.
+ */
+struct fwnode_handle *
+fwnode_graph_get_remote_port(const struct fwnode_handle *fwnode)
+{
+	return fwnode_get_next_parent(fwnode_graph_get_remote_endpoint(fwnode));
+}
+EXPORT_SYMBOL_GPL(fwnode_graph_get_remote_port);
+
+/**
+ * fwnode_graph_get_remote_endpoint - Return fwnode of a remote endpoint
+ * @fwnode: Endpoint firmware node pointing to the remote endpoint
+ *
+ * Extracts firmware node of a remote endpoint the @fwnode points to.
+ */
+struct fwnode_handle *
+fwnode_graph_get_remote_endpoint(const struct fwnode_handle *fwnode)
+{
+	return fwnode_call_ptr_op(fwnode, graph_get_remote_endpoint);
+}
+EXPORT_SYMBOL_GPL(fwnode_graph_get_remote_endpoint);
+
+static bool fwnode_graph_remote_available(struct fwnode_handle *ep)
+{
+	struct fwnode_handle *dev_node;
+	bool available;
+
+	dev_node = fwnode_graph_get_remote_port_parent(ep);
+	available = fwnode_device_is_available(dev_node);
+	fwnode_handle_put(dev_node);
+
+	return available;
+}
+
+/**
+ * fwnode_graph_get_endpoint_by_id - get endpoint by port and endpoint numbers
+ * @fwnode: parent fwnode_handle containing the graph
+ * @port: identifier of the port node
+ * @endpoint: identifier of the endpoint node under the port node
+ * @flags: fwnode lookup flags
+ *
+ * Return the fwnode handle of the local endpoint corresponding the port and
+ * endpoint IDs or NULL if not found.
+ *
+ * If FWNODE_GRAPH_ENDPOINT_NEXT is passed in @flags and the specified endpoint
+ * has not been found, look for the closest endpoint ID greater than the
+ * specified one and return the endpoint that corresponds to it, if present.
+ *
+ * Does not return endpoints that belong to disabled devices or endpoints that
+ * are unconnected, unless FWNODE_GRAPH_DEVICE_DISABLED is passed in @flags.
+ *
+ * The returned endpoint needs to be released by calling fwnode_handle_put() on
+ * it when it is not needed any more.
+ */
+struct fwnode_handle *
+fwnode_graph_get_endpoint_by_id(const struct fwnode_handle *fwnode,
+				u32 port, u32 endpoint, unsigned long flags)
+{
+	struct fwnode_handle *ep, *best_ep = NULL;
+	unsigned int best_ep_id = 0;
+	bool endpoint_next = flags & FWNODE_GRAPH_ENDPOINT_NEXT;
+	bool enabled_only = !(flags & FWNODE_GRAPH_DEVICE_DISABLED);
+
+	fwnode_graph_for_each_endpoint(fwnode, ep) {
+		struct fwnode_endpoint fwnode_ep = { 0 };
+		int ret;
+
+		if (enabled_only && !fwnode_graph_remote_available(ep))
+			continue;
+
+		ret = fwnode_graph_parse_endpoint(ep, &fwnode_ep);
+		if (ret < 0)
+			continue;
+
+		if (fwnode_ep.port != port)
+			continue;
+
+		if (fwnode_ep.id == endpoint)
+			return ep;
+
+		if (!endpoint_next)
+			continue;
+
+		/*
+		 * If the endpoint that has just been found is not the first
+		 * matching one and the ID of the one found previously is closer
+		 * to the requested endpoint ID, skip it.
+		 */
+		if (fwnode_ep.id < endpoint ||
+		    (best_ep && best_ep_id < fwnode_ep.id))
+			continue;
+
+		fwnode_handle_put(best_ep);
+		best_ep = fwnode_handle_get(ep);
+		best_ep_id = fwnode_ep.id;
+	}
+
+	return best_ep;
+}
+EXPORT_SYMBOL_GPL(fwnode_graph_get_endpoint_by_id);
+
+/**
+ * fwnode_graph_get_endpoint_count - Count endpoints on a device node
+ * @fwnode: The node related to a device
+ * @flags: fwnode lookup flags
+ * Count endpoints in a device node.
+ *
+ * If FWNODE_GRAPH_DEVICE_DISABLED flag is specified, also unconnected endpoints
+ * and endpoints connected to disabled devices are counted.
+ */
+unsigned int fwnode_graph_get_endpoint_count(struct fwnode_handle *fwnode,
+					     unsigned long flags)
+{
+	struct fwnode_handle *ep;
+	unsigned int count = 0;
+
+	fwnode_graph_for_each_endpoint(fwnode, ep) {
+		if (flags & FWNODE_GRAPH_DEVICE_DISABLED ||
+		    fwnode_graph_remote_available(ep))
+			count++;
+	}
+
+	return count;
+}
+EXPORT_SYMBOL_GPL(fwnode_graph_get_endpoint_count);
+
+/**
+ * fwnode_graph_parse_endpoint - parse common endpoint node properties
+ * @fwnode: pointer to endpoint fwnode_handle
+ * @endpoint: pointer to the fwnode endpoint data structure
+ *
+ * Parse @fwnode representing a graph endpoint node and store the
+ * information in @endpoint. The caller must hold a reference to
+ * @fwnode.
+ */
+int fwnode_graph_parse_endpoint(const struct fwnode_handle *fwnode,
+				struct fwnode_endpoint *endpoint)
+{
+	memset(endpoint, 0, sizeof(*endpoint));
+
+	return fwnode_call_int_op(fwnode, graph_parse_endpoint, endpoint);
+}
+EXPORT_SYMBOL(fwnode_graph_parse_endpoint);
+
+const void *device_get_match_data(const struct device *dev)
+{
+	return fwnode_call_ptr_op(dev_fwnode(dev), device_get_match_data, dev);
+}
+EXPORT_SYMBOL_GPL(device_get_match_data);
+
+static unsigned int fwnode_graph_devcon_matches(const struct fwnode_handle *fwnode,
+						const char *con_id, void *data,
+						devcon_match_fn_t match,
+						void **matches,
+						unsigned int matches_len)
+{
+	struct fwnode_handle *node;
+	struct fwnode_handle *ep;
+	unsigned int count = 0;
+	void *ret;
+
+	fwnode_graph_for_each_endpoint(fwnode, ep) {
+		if (matches && count >= matches_len) {
+			fwnode_handle_put(ep);
+			break;
+		}
+
+		node = fwnode_graph_get_remote_port_parent(ep);
+		if (!fwnode_device_is_available(node)) {
+			fwnode_handle_put(node);
+			continue;
+		}
+
+		ret = match(node, con_id, data);
+		fwnode_handle_put(node);
+		if (ret) {
+			if (matches)
+				matches[count] = ret;
+			count++;
+		}
+	}
+	return count;
+}
+
+static unsigned int fwnode_devcon_matches(const struct fwnode_handle *fwnode,
+					  const char *con_id, void *data,
+					  devcon_match_fn_t match,
+					  void **matches,
+					  unsigned int matches_len)
+{
+	struct fwnode_handle *node;
+	unsigned int count = 0;
+	unsigned int i;
+	void *ret;
+
+	for (i = 0; ; i++) {
+		if (matches && count >= matches_len)
+			break;
+
+		node = fwnode_find_reference(fwnode, con_id, i);
+		if (IS_ERR(node))
+			break;
+
+		ret = match(node, NULL, data);
+		fwnode_handle_put(node);
+		if (ret) {
+			if (matches)
+				matches[count] = ret;
+			count++;
+		}
+	}
+
+	return count;
+}
+
+/**
+ * fwnode_connection_find_match - Find connection from a device node
+ * @fwnode: Device node with the connection
+ * @con_id: Identifier for the connection
+ * @data: Data for the match function
+ * @match: Function to check and convert the connection description
+ *
+ * Find a connection with unique identifier @con_id between @fwnode and another
+ * device node. @match will be used to convert the connection description to
+ * data the caller is expecting to be returned.
+ */
+void *fwnode_connection_find_match(const struct fwnode_handle *fwnode,
+				   const char *con_id, void *data,
+				   devcon_match_fn_t match)
+{
+	unsigned int count;
+	void *ret;
+
+	if (!fwnode || !match)
+		return NULL;
+
+	count = fwnode_graph_devcon_matches(fwnode, con_id, data, match, &ret, 1);
+	if (count)
+		return ret;
+
+	count = fwnode_devcon_matches(fwnode, con_id, data, match, &ret, 1);
+	return count ? ret : NULL;
+}
+EXPORT_SYMBOL_GPL(fwnode_connection_find_match);
+
+/**
+ * fwnode_connection_find_matches - Find connections from a device node
+ * @fwnode: Device node with the connection
+ * @con_id: Identifier for the connection
+ * @data: Data for the match function
+ * @match: Function to check and convert the connection description
+ * @matches: (Optional) array of pointers to fill with matches
+ * @matches_len: Length of @matches
+ *
+ * Find up to @matches_len connections with unique identifier @con_id between
+ * @fwnode and other device nodes. @match will be used to convert the
+ * connection description to data the caller is expecting to be returned
+ * through the @matches array.
+ * If @matches is NULL @matches_len is ignored and the total number of resolved
+ * matches is returned.
+ *
+ * Return: Number of matches resolved, or negative errno.
+ */
+int fwnode_connection_find_matches(const struct fwnode_handle *fwnode,
+				   const char *con_id, void *data,
+				   devcon_match_fn_t match,
+				   void **matches, unsigned int matches_len)
+{
+	unsigned int count_graph;
+	unsigned int count_ref;
+
+	if (!fwnode || !match)
+		return -EINVAL;
+
+	count_graph = fwnode_graph_devcon_matches(fwnode, con_id, data, match,
+						  matches, matches_len);
+
+	if (matches) {
+		matches += count_graph;
+		matches_len -= count_graph;
+	}
+
+	count_ref = fwnode_devcon_matches(fwnode, con_id, data, match,
+					  matches, matches_len);
+
+	return count_graph + count_ref;
+}
+EXPORT_SYMBOL_GPL(fwnode_connection_find_matches);